Ni-Cr-W三元系富Ni侧fcc相的互扩散及原子迁移率参数研究

Interdiffusion and Atomic Mobilities in Ni-rich fcc Ni-Cr-W Alloys

摘要:

利用电子探针微量分析与Whittle and Green方法确定了在1200℃下退火72小时的三元合金Ni-Cr-W体系的互扩散系数。通过DICTRA软件包对实验互扩散系数进行评估以确定原子迁移率。通过全面分析比较模型预测的扩散特性和实验数据,良好一致性验证了原子迁移率参数的合理性。 Ni-Cr-W三元体系中的扩散现象,如扩散路径和浓度-距离曲线可以通过目前获得的原子迁移率合理地描述,进一步证明了本研究所获得的原子迁移率参数的可靠性。

Abstract:

Six diffusion couples of Ni-Cr-W ternary alloys were prepared, annealed at 1473 K for 72 hours and measured by using the electron probe microanalysis combined with Whittle and Green method in order to determine the interdiffusion coefficients. The experimental interdiffusion coefficients were critically assessed to obtain the atomic mobilities by means of DICTRA software package. A good agreement has been obtained by comprehensive comparison between the experimental data and the model-predicted diffusion properties, which verifies the reliability of the atomic mobilities of Ni, Cr and W in Ni-Cr-W alloys. The diffusion phenomena, such as diffusion paths and the concentration-distance profiles in the Ni-Cr-W ternary system can be reasonably described by the presently obtained atomic mobilities.